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MS4 Program Evaluation Guidance A how-to guide on evaluating MS4 stormwater programs

MS4 Program Evaluation Guidance A how-to guide on evaluating MS4 stormwater programs 2025

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Appendix B provides program evaluation worksheets designed to assist evaluators in conducting detailed on-site evaluations of stormwater management programs. Each worksheet focuses on specific components such as program management, public education, maintenance, construction, post-construction, industrial/commercial operations, and illicit discharges. The worksheets include key questions for staff interviews and document reviews to ensure compliance with MS4 permit requirements and effective implementation of stormwater management plans.

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What is the difference between waste discharge requirements and NPDES?

Waste Discharge Requirements/NPDES Permits Generally, waste discharge requirements are needed to discharge waste to land, and National Pollutant Discharge Elimination System (NPDES) permits administered by the RWQCB on behalf of the U.S. Environmental Protection Agency are needed to discharge waste to surface waters.

What is the Clean Water Act for MS4?

Each regulated MS4 is required to develop and implement a stormwater management program (SWMP) to reduce the contamination of stormwater runoff and prohibit illicit discharges. For more information on this permit program, visit EPAs Discharges From Municipal Separate Storm Sewer Systems (MS4s) Web page.

What three general types of monitoring requirements does the NPDES permit contain?

The monitoring and reporting conditions section of an NPDES permit generally includes specific requirements for the following items: Monitoring locations. Monitoring frequencies. Sample collection methods.

What is a phase II MS4?

EPAs Phase II stormwater rule establishes a National Pollutant Discharge Elimination System (NPDES) program for small MS4s that is intended to improve the Nations waterways by reducing the quantity of pollutants that stormwater picks up and carries into storm sewer systems during storm events.

What does MS4 mean?

The short story is that MS4 stands for municipal separate storm sewer system. Stormwater Maui, specifically, explains it as a permitted storm water drainage system. But the purpose and role of an MS4 is more expansive. In this article, we will explore MS4s what they do, how they work and more.

What is the Npdes MS4 compliance?

To prevent harmful pollutants from being washed or dumped into urban waterways, MS4 operators are required to obtain NPDES permits and develop stormwater management programs (SWMPs) intended to eliminate pollutants to the maximum extent practicable (MEP).